I love my ball winder, though with Big skeins, I generally split it into smaller balls. Though I would like to get a yardage meter, purely from the fact that when I knit socks and still have (I think) enough left over to make more, I would rather know for sure. And the other reason is I'll buy almost anything, as long as I know what it does.
Wisdom is knowing what to do. Skill is how to do it. Virtue is getting it done.
That which does not kill you, isn't trying hard enough.